<template>
  <div class="player" v-show="playlist.length>0">
    <transition
      name="normal"
      @enter="enter"
      @after-enter="afterEnter"
      @leave="leave"
      @after-leave="afterLeave"
    >
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
          <img width="100%" height="100%" :src="currentSong.image" />
        </div>
        <div class="top">
          <div class="back" @click="back">
            <i class="icon-back"></i>
          </div>
          <h1 class="title" v-html="currentSong.name"></h1>
          <h2 class="subtitle" v-html="currentSong.singer"></h2>
        </div>
        <!-- <div class="middle"
                     @touchstart.prevent="middleTouchStart"
                     @touchmove.prevent="middleTouchMove"
                     @touchend="middleTouchEnd"
        >-->
        <div class="middle">
          <div class="middle-l" ref="middleL">
            <div class="cd-wrapper" ref="cdWrapper">
              <div class="cd" :class="cdCls">
                <img class="image" :src="currentSong.image" />
              </div>
            </div>
            <div class="playing-lyric-wrapper">
              <div class="playing-lyric">{{playingLyric}}</div>
            </div>
          </div>
          <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p
                  ref="lyricLine"
                  class="text"
                  :class="{'current': currentLineNum ===index}"
                  v-for="(line,index) in currentLyric.lines"
                >{{line.txt}}</p>
              </div>
            </div>
          </scroll>
        </div>
        <div class="bottom">
          <!-- <div class="dot-wrapper">
                        <span class="dot" :class="{'active':currentShow==='cd'}"></span>
                        <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
          </div>-->
          <div class="progress-wrapper">
            <span class="time time-l">{{format(currentTime)}}</span>
            <div class="progress-bar-wrapper">
              <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
            </div>
            <span class="time time-r">{{format(currentSong.duration)}}</span>
          </div>
          <div class="operators">
            <div class="icon i-left" @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left" :class="disableCls">
              <i @click="prev" class="icon-prev"></i>
            </div>
            <div class="icon i-center" :class="disableCls">
              <i @click="togglePlaying" :class="playIcon"></i>
            </div>
            <div class="icon i-right" :class="disableCls">
              <i @click="next" class="icon-next"></i>
            </div>
            <div class="icon i-right">
              <!-- <i class="icon" @click="toggleFavorite(currentSong)"
              :class="getFavoriteIcon(currentSong)"></i>-->
            </div>
          </div>
        </div>
      </div>
    </transition>
    <transition name="mini">
      <div id="lzl" class="mini-player mini-player-index" v-show="!fullScreen" @click="open">
        <div class="icon">
          <img :class="cdCls" width="40" heoght="40" :src="currentSong.image" />
        </div>
        <div class>
          <h2 class="name" v-html="currentSong.name? currentSong.name.substr(0,12):''"></h2>
          <p class="desc" v-html="currentSong.singer"></p>
        </div>
        <div class="control2">
          <progress-circle :radius="radius" :percent="percent">
            <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
          </progress-circle>
        </div>
        <div class="control" @click.stop="showPlaylist">
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <playlist ref="playlist"></playlist>
    <audio ref="audio" :src="currentSong.url" @play="ready" @timeupdate="updateTime" @ended="end"></audio>
  </div>
</template>


<script type="text/ecmascript-6">
import { mapGetters, mapMutations, mapActions } from "vuex";
import animations from "create-keyframe-animation";
import { prefixStyle } from "common/js/dom";
import ProgressBar from "base/progress-bar/progress-bar";
import ProgressCircle from "base/progress-circle/progress-circle";
import { playMode } from "common/js/config";
import { shuffle } from "common/js/util";
import Lyric from "lyric-parser";
import Scroll from "base/scroll/scroll";
import Playlist from "components/playlist/playlist";
import { playerMixin } from "common/js/mixin";

const transform = prefixStyle("transform");
const transitionDuration = prefixStyle("transitionDuration");

export default {
  mixins: [playerMixin],
  name: "player",
  data() {
    return {
      songReady: false, //当歌曲加载时是否可操作  默认false
      currentTime: 0,
      radius: 32,
      currentLyric: null,
      currentLineNum: 0,
      currentShow: "cd",
      playingLyric: "",
      wz: true
    };
  },
  computed: {
    cdCls() {
      
      return this.playing ? "play" : "play pause";
    },
    playIcon() {
      
      return this.playing ? "icon-pause" : "icon-play";
    },

    miniIcon() {
      
      return this.playing ? "icon-pause-mini" : "icon-play-mini";
    },
    disableCls() {
      
      //当歌曲加载时 设置一个css属性disable
      return this.songReady ? "" : "disable";
    },
    percent() {
      
      return this.currentTime / this.currentSong.duration; //当前播放的时间 除以总时长
    },
    ...mapGetters(["fullScreen", "playing", "currentIndex"])
  },
  created() {
    this.touch = {};
  },
  methods: {
    //错误做法： this.fullScreen = false
    //正确做法： 通过mapMutations写入
    back() {
      this.setFullScreen(false);
      var _this = this 
      window.removeEventListener("popstate", _this.backChange, false);
    },
    open() {
      
      this.setFullScreen(true);
    },
    backChange() {
      //history.pushState(null, null, document.URL);
      var _this = this;
      _this.back();
      
      
    },
    //事件钩子: 创建CSS3动画
    enter(el, done) {
      console.log("5+++")
      var _this = this
      sessionStorage.clear();
      history.pushState(null, null, document.URL);
      window.addEventListener("popstate", _this.backChange, false);
      const { x, y, scale } = this._getPosAndScale();
      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      };
      animations.registerAnimation({
        name: "move", //动画名称
        animation,
        presets: {
          duration: 400, //动画间隔
          easing: "linear" //晃动 // linear 线系
        }
      });
      animations.runAnimation(this.$refs.cdWrapper, "move", done); //注册动画 done 回调函数
    },
    afterEnter() {
      animations.unregisterAnimation("move");
      this.$refs.cdWrapper.style.animation = ""; //清空动画
    },
    leave(el, done) {
      this.$refs.cdWrapper.style.transition = "all 0.4s";
      const { x, y, scale } = this._getPosAndScale();
      this.$refs.cdWrapper.style[
        transform
      ] = `translate3d(${x}px,${y}px,0) scale(${scale})`;
      this.$refs.cdWrapper.addEventListener("transitionend", done);
    },
    afterLeave() {
      this.$refs.cdWrapper.style.transition = "";
      this.$refs.cdWrapper.style[transform] = "";
    },
    //控制播放状态
    togglePlaying() {
      if (!this.songReady) {
        return;
      }
      this.setPlayingState(!this.playing);
      if (this.currentLyric) {
        this.currentLyric.togglePlay(); //歌词切换播放暂停
      }
    },
    end() {
      if (this.mode === playMode.loop) {
        this.loop();
      } else {
        this.next();
      }
    },
    loop() {
      this.$refs.audio.currentTime = 0;
      this.$refs.audio.play();
      if (this.currentLyric) {
        this.currentLyric.seek(0); //歌词偏移到一开始
      }
    },
    //上一首
    prev() {
      if (!this.songReady) {
        //当歌曲加载时,禁止操作
        return;
      }
      if (this.playlist.length === 1) {
        //只有一首歌，单曲循环
        this.loop();
        return;
      } else {
        let index = this.currentIndex - 1;
        if (index === -1) {
          index = this.playlist.length - 1;
        }
        this.setCurrentIndex(index);
        if (!this.playing) {
          this.togglePlaying();
        }
      }
      this.songReady = false;
    },
    //下一首
    next() {
      if (!this.songReady) {
        //当歌曲加载时,禁止操作
        return;
      }
      if (this.playlist.length === 1) {
        //只有一首歌，单曲循环
        this.loop();
        return;
      } else {
        let index = this.currentIndex + 1;
        if (index === this.playlist.length) {
          index = 0;
        }
        this.setCurrentIndex(index);
        if (!this.playing) {
          this.togglePlaying();
        }
      }
      this.songReady = false;
    },
    ready() {
      this.songReady = true;
      this.savePlayHistory(this.currentSong);
    },
    error() {
      this.songReady = true; //当歌曲发生错误 设置songReady 为true
    },
    updateTime(e) {
      this.currentTime = e.target.currentTime;
    },
    format(interval) {
      interval = interval | 0;
      const minute = (interval / 60) | 0;
      const second = this._pad(interval % 60); //this._pad 补零
      return `${minute}:${second}`;
    },
    onProgressBarChange(percent) {
      const currentTime = this.currentSong.duration * percent;
      this.$refs.audio.currentTime = currentTime;
      if (!this.playing) {
        this.togglePlaying();
      }
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000); //偏移歌词到拖动时间的对应位置
      }
    },

    //获取解析后的歌词
    getLyric() {
      this.currentSong
        .getLyric()
        .then(lyric => {
          if (this.currentSong.lyric !== lyric) {
            return;
          }
          //实例化lyric对象
          this.currentLyric = new Lyric(lyric, this.handleLyric);
          //  console.log(this.currentLyric)
          if (this.playing) {
            this.currentLyric.play();
          }
        })
        .catch(() => {
          //请求失败，清理数据
          this.currentLyric = null;
          this.playingLyric = "";
          this.currentLineNum = 0;
        });
    },
    handleLyric({ lineNum, txt }) {
      this.currentLineNum = lineNum;
      if (lineNum > 5) {
        let lineEl = this.$refs.lyricLine[lineNum - 5]; //保证歌词在中间位置滚动
        this.$refs.lyricList.scrollToElement(lineEl, 1000);
      } else {
        this.$refs.lyricList.scrollTo(0, 0, 1000); //滚动到顶部
      }
      this.playingLyric = txt;
    },
    //歌词滑动
    middleTouchStart(e) {
      this.touch.initiated = true; //初始化标志位
      const touch = e.touches[0];
      this.touch.startX = touch.pageX;
      this.touch.startY = touch.pageY;
    },
    middleTouchMove(e) {
      if (!this.touch.initiated) {
        return;
      }
      const touch = e.touches[0];
      const deltaX = touch.pageX - this.touch.startX;
      const deltaY = touch.pageY - this.touch.startY;
      //维护deltaY原因：歌词本身Y轴滚动，当|deltaY| > |deltaX|时，不滑动歌词
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        return;
      }
      const left = this.currentShow === "cd" ? 0 : -window.innerWidth;
      const offsetWidth = Math.min(
        0,
        Math.max(-window.innerWidth, left + deltaX)
      );
      this.touch.percent = Math.abs(offsetWidth / window.innerWidth);
      //滑入歌词offsetWidth = 0 + deltaX(负值)  歌词滑出offsetWidth = -innerWidth + delta(正值)
      this.$refs.lyricList.$el.style[
        transform
      ] = `translate3d(${offsetWidth}px, 0, 0)`;
      this.$refs.lyricList.$el.style[transitionDuration] = 0;
      this.$refs.middleL.style.opacity = 1 - this.touch.percent; //透明度随percent改变
      this.$refs.middleL.style[transitionDuration] = 0;
    },
    middleTouchEnd() {
      //优化：手动滑入滑出10%时，歌词自动滑过
      let offsetWidth;
      let opacity;
      if (this.currentShow === "cd") {
        if (this.touch.percent > 0.1) {
          offsetWidth = -window.innerWidth;
          opacity = 0;
          this.currentShow = "lyric";
        } else {
          offsetWidth = 0;
          opacity = 1;
        }
      } else {
        if (this.touch.percent < 0.9) {
          offsetWidth = 0;
          opacity = 1;
          this.currentShow = "cd";
        } else {
          offsetWidth = -window.innerWidth;
          opacity = 0;
        }
      }
      const time = 300;
      this.$refs.lyricList.$el.style[
        transform
      ] = `translate3d(${offsetWidth}px, 0, 0)`;
      this.$refs.lyricList.$el.style[transitionDuration] = `${time}ms`;
      this.$refs.middleL.style.opacity = opacity;
      this.$refs.middleL.style[transitionDuration] = `${time}ms`;
    },
    _pad(num, n = 2) {
      //用0补位，补2位字符串长度
      let len = num.toString().length;
      while (len < n) {
        num = "0" + num;
        len++;
      }
      return num;
    },
    //获取初始位置及缩放尺寸
    _getPosAndScale() {
      const targetWidth = 40; //mini-player icon宽度
      const width = window.innerWidth * 0.8; //cd-wrapper宽度
      const paddingLeft = 40;
      const paddingTop = 80;
      const paddingBottom = 30; //mini-player icon中心距底部位置
      const scale = targetWidth / width;
      const x = -(window.innerWidth / 2 - paddingLeft); //X轴方向移动的距离
      const y = window.innerHeight - paddingTop - width / 2 - paddingBottom;
      return {
        x,
        y,
        scale
      };
    },
    //控制播放列表
    showPlaylist() {
      this.$refs.playlist.show();
    },
    ...mapMutations({
      setFullScreen: "SET_FULL_SCREEN"
    }),
    ...mapActions(["savePlayHistory"])
  },
  watch: {
    $route(to, from) {
      //debugger;
      console.log(to)
      console.log(from)
      if(to.path=="/FreePage")
      {
        document.getElementById("lzl").classList.add("mini-player-index");
        return
      }
      if(to.path=="/StoryDetail")
      {
        document.getElementById("lzl").classList.add("mini-player-index");
        return
      }
      if (to.path == "/recommend") {
        this.wz = false;
        document.getElementById("lzl").classList.add("mini-player-lzl");
        document.getElementById("lzl").classList.remove("mini-player-index");
      } else {
        this.wz = true;
        document.getElementById("lzl").classList.remove("mini-player-lzl");
        document.getElementById("lzl").classList.add("mini-player-index");
        
      }
    },
    currentSong(newSong, oldSong) {
      // debugger
      if (!newSong.id) {
        return;
      }
      if (newSong.id === oldSong.id) {
        return;
      }
      if (this.currentLyric) {
        this.currentLyric.stop(); //切换歌曲后，清空前一首歌歌词Layric实例中的定时器
        this.currentTime = 0;
        this.playingLyric = "";
        this.currentLineNum = 0;
      }
      //确保DOM已存在 不使用this.$nextTick，保证手机微信中从后台切回前台时歌曲重新播放
      clearTimeout(this.timer);
      this.timer = setTimeout(() => {
        //this.$refs.audio.currentTime = 100  //TODO 断点续播
        this.$refs.audio.play();
        //  this.currentSong.getLyric()//测试歌词
        //this.getLyric()
      }, 1000);
    },

    playing(newPlaying) {
      //  debugger
      const audio = this.$refs.audio;
      this.$nextTick(() => {
        //确保DOM已存在
        newPlaying ? audio.play() : audio.pause();
      });
    }
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll,
    Playlist
  }
};
</script>


<style lang="stylus" scoped>
@import '../../common/stylus/variable';
@import '../../common/stylus/mixin';

.player {
  .normal-player {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 150;
    background: $color-background;

    .background {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      opacity: 0.6;
      filter: blur(20px);
    }

    // 背景模糊
    .top {
      position: relative;
      margin-bottom: 25px;

      .back {
        position: absolute;
        top: 0;
        left: 6px;
        z-index: 50;

        .icon-back {
          display: block;
          padding: 9px;
          font-size: $font-size-large-x;
          color: $color-theme;
          transform: rotate(-90deg);
        }
      }

      .title {
        width: 70%;
        margin: 0 auto;
        line-height: 40px;
        text-align: center;
        no-wrap();
        font-size: $font-size-large;
        color: $color-text;
      }

      .subtitle {
        line-height: 20px;
        text-align: center;
        font-size: $font-size-medium;
        color: $color-text;
      }
    }

    .middle {
      position: fixed;
      width: 100%;
      top: 80px;
      bottom: 170px;
      white-space: nowrap;
      font-size: 0;

      .middle-l {
        display: inline-block;
        vertical-align: top;
        position: relative;
        width: 100%;
        height: 0;
        padding-top: 80%;

        .cd-wrapper {
          position: absolute;
          left: 10%;
          top: 0;
          width: 80%;
          height: 100%;

          .cd {
            width: 100%;
            height: 100%;
            box-sizing: border-box;
            border: 10px solid rgba(255, 255, 255, 0.1);
            border-radius: 50%;

            &.play {
              animation: rotate 20s linear infinite;
            }

            // CD 旋转
            &.pause {
              animation-play-state: paused;
            }

            .image {
              position: absolute;
              left: 0;
              top: 0;
              width: 100%;
              height: 100%;
              border-radius: 50%;
            }
          }
        }

        .playing-lyric-wrapper {
          width: 80%;
          margin: 30px auto 0 auto;
          overflow: hidden;
          text-align: center;

          .playing-lyric {
            height: 20px;
            line-height: 20px;
            font-size: $font-size-medium;
            color: $color-text-l;
          }
        }
      }

      .middle-r {
        display: inline-block;
        vertical-align: top;
        width: 100%;
        height: 100%;
        overflow: hidden;

        .lyric-wrapper {
          width: 80%;
          margin: 0 auto;
          overflow: hidden;
          text-align: center;

          .text {
            line-height: 32px;
            color: $color-text-l;
            font-size: $font-size-medium;

            &.current {
              color: $color-text;
            }
          }
        }
      }
    }

    .bottom {
      position: absolute;
      bottom: 50px;
      width: 100%;

      .dot-wrapper {
        text-align: center;
        font-size: 0;

        .dot {
          display: inline-block;
          vertical-align: middle;
          margin: 0 4px;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          background: $color-text-l;

          &.active {
            width: 20px;
            border-radius: 5px;
            background: $color-text-ll;
          }
        }
      }

      .progress-wrapper {
        display: flex; // flex布局
        align-items: center;
        width: 80%;
        margin: 0px auto;
        padding: 10px 0;

        .time {
          color: $color-text;
          font-size: $font-size-small;
          flex: 0 0 30px;
          line-height: 30px;
          width: 30px;

          &.time-l {
            text-align: left;
          }

          &.time-r {
            text-align: right;
          }
        }

        .progress-bar-wrapper {
          flex: 1;
        }
      }

      .operators {
        display: flex;
        align-items: center;

        .icon {
          flex: 1;
          color: $color-theme;

          &.disable {
            color: $color-theme-d;
          }

          i {
            font-size: 30px;
          }
        }

        .i-left {
          text-align: right;
        }

        .i-center {
          padding: 0 20px;
          text-align: center;

          i {
            font-size: 40px;
          }
        }

        .i-right {
          text-align: left;
        }

        .icon-favorite {
          color: $color-sub-theme;
        }
      }
    }

    &.normal-enter-active, &.normal-leave-active {
      transition: all 0.4s;

      .top, .bottom {
        transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32);
      }
    }

    &.normal-enter, &.normal-leave-to {
      opacity: 0;

      .top {
        transform: translate3d(0, -100px, 0);
      }

      .bottom {
        transform: translate3d(0, 100px, 0);
      }
    }
  }

  .mini-player-lzl {
    bottom: 70px;
  }

  .mini-player-index {
    bottom: 0px;
  }

  .mini-player {
    display: flex;
    align-items: center;
    position: fixed;
    left: 0;
    z-index: 180;
    width: 100%;
    height: 60px;
    background: $color-highlight-background;

    &.mini-enter-active, &.mini-leave-active {
      transition: all 0.4s;
    }

    &.mini-enter, &.mini-leave-to {
      opacity: 0;
    }

    .icon {
      flex: 0 0 60px;
      width: 80px;
      padding: 0 10px 0 20px;

      img {
        border-radius: 50%;

        &.play {
          animation: rotate 10s linear infinite;
        }

        &.pause {
          animation-play-state: paused;
        }
      }
    }

    .text {
      display: flex;
      flex-direction: column;
      justify-content: center;
      flex: 1;
      line-height: 20px;
      overflow: hidden;

      .name {
        margin-bottom: 2px;
        no-wrap();
        font-size: $font-size-medium;
        color: $color-text;
      }

      .desc {
        no-wrap();
        font-size: $font-size-small;
        color: $color-text-d;
      }
    }

    .control2 {
      flex: 0 0 30px;
      width: 30px;
      padding: 0 20px;
      position: absolute;
      right: 20%;

      .icon-play-mini, .icon-pause-mini, .icon-playlist {
        font-size: 30px;
        color: $color-theme-d;
      }

      .icon-mini {
        font-size: 32px;
        position: absolute;
        left: 0;
        top: 0;
      }
    }

    .control {
      flex: 0 0 30px;
      width: 30px;
      padding: 0 20px;
      position: absolute;
      right: 8%;

      .icon-play-mini, .icon-pause-mini, .icon-playlist {
        font-size: 30px;
        color: $color-theme-d;
      }

      .icon-mini {
        font-size: 32px;
        position: absolute;
        left: 0;
        top: 0;
      }
    }
  }
}

@keyframes rotate {
  0% {
    transform: rotate(0);
  }

  100% {
    transform: rotate(360deg);
  }
}
</style>
